//
//  AVAsset+STTools.h
//  VideoCollage
//
//  Created by Mac on 2018/6/20.
//  Copyright © 2018年 stoneobs.qq.com. All rights reserved.
//

#import <AVFoundation/AVFoundation.h>
/************资源准备******************/
@interface AVAsset (STTools)
- (AVAssetTrack *)firstVideoTrack;
- (AVAssetTrack *)firstAudioTrack;
//加载每个视频 准备合成
- (void)whenProperties:(NSArray *)names areReadyDo:(void (^)(void))block ;
@end
